Winding machine

ABSTRACT

A winding machine ( 1 ) for winding up sensitive bobbin material ( 8 ), for example yarn or tape, arriving from a feeding apparatus ( 11 ) includes a winding spindle ( 4 ) being designed and arranged to be rotated by a drive. A unit ( 14 ) of the machine ( 1 ) serves to determine a signal which is approximately proportional to the tension of the bobbin material ( 8 ). The unit ( 14 ) includes an arm ( 15 ) being designed and arranged to be movable to a limited extent and only one roller ( 16 ) being arranged at the arm ( 15 ). The only one roller ( 16 ) is designed and arranged to guide the bobbin material ( 8 ) to contact the feeding apparatus ( 11 ) and the roller ( 16 ) without contacting other elements in between. Especially, the winding machine ( 1 ) may include a plurality of winding heads ( 30 ) each including a winding spindle ( 4 ), a traversing apparatus ( 10 ) and a unit ( 14 ) for winding up bobbin material ( 8 ) arriving from a plurality of feeding apparatuses ( 11 ).

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of co-pending German PatentApplication No. 100 46 844 entitled “Spulmaschine für insbesondereempfindliches Spulgut”, filed on Sept. 20, 2000.

FIELD OF THE INVENTION

[0002] The present invention generally relates to a winding machine forwinding up bobbin material arriving from a feeding apparatus. Thewinding machine includes a winding spindle being designed and arrangedto be rotated by a drive and a unit for determining a signal which isproportional to the tension of the bobbin material.

BACKGROUND OF THE INVENTION

[0003] In many cases, the feeding apparatus which delivers the materialto be wound up is not a structural component of the winding machine, butit is arranged in the end portion of a producing apparatus, for examplea spinning apparatus, a finishing apparatus or the like being locatedupstream of the winding machine. However, there may also be a specialarriving portion including guiding rollers which is located at thewinding machine. Especially, the bobbin material may be sensitivematerial as, for example, yarn or tape. The bobbin material may be madeof carbon fibers or glass fibers which are sensitive with respect tobending or friction. A plurality of changes concerning the direction ofmovement of the bobbin material and great angles of the bobbin beingsurrounded by the bobbin material at small radiuses may harm the bobbinmaterial to an unacceptable extent. Such changing bending loads of thebobbin material are typical of known dancer arm arrangements in knownwinding machines.

[0004] A winding machine is known from German Patent No. 37 23 593 C1.The known winding machine includes a winding spindle which is driven bya controllable drive. A bobbin is located on the winding spindle, thebobbin carrying the bobbin material to be wound up by the machine. Thebobbin material is put on the bobbin in a traversing manner by atraversing apparatus or a different yarn guiding apparatus. A dancerdevice is arranged upstream of the traversing apparatus, the dancerdevice determining a signal which is proportional to the tensionprevailing in the bobbin material (in other words: the tractive forcesubjecting the material). The signal is used to control the drive of thewinding spindle. The known dancer arm arrangement further includes twostationary deflection rollers between which the dancer arm is arranged.The bobbin material surrounds the three rollers in a way of a liftingblock assembly. A change of the tension of the yarn effects a movementof the dancer arm. The movement of the dancer arm is determined withrespect to its value and its direction. The signal is used as themanipulated variable in the control loop for the control of the drive ofthe winding spindle. The engine of the drive is influenced in a way thatthe tension in the bobbin material returns to its former value. Thetension in the bobbin material is produced by the dancer arm. For thispurpose, the dancer arm is subjected by the force of a spring and/or bya weight. The tension produced in the bobbin material in this way has tobe compensated by the engine of the drive of the winding spindle duringthe winding process. The torque being transmitted to the winding spindleby the engine of the drive does not depend from the control tension ofthe motor and from the number of rotations corresponding to the motordiagram. A torque control is used in the known machine. The number ofrotations of the winding spindle is independent from the velocity of thearriving bobbin material and from the diameter of the material beingwound up on the winding spindle.

[0005] A winding machine for yarn arriving at constant velocity is knownfrom European Patent No. 0 712 374 B1. The known winding machineincludes a traversing apparatus for moving the yarn back and forth in adirection transverse to its main direction of movement. The knownmachine includes a winding spindle being driven by a motor. A dancer armdevice includes two stationary deflection rollers and a deflectionroller being located on the dancer arm. The dancer arm device is used todetermine a signal which is proportional to the tension in the bobbinmaterial. The bobbin material has to contact and surround a plurality ofdeflection rollers at least at partially substantial surrounding angles.Consequently, the bobbin material is subjected to substantial bendingloads and also to changing bending loads in combination with respectivefriction forces. Especially in case of sensitive bobbin material beingused, the bobbin material may be harmed or even destroyed.

[0006] An apparatus for measuring the tension of moving yarn is knownfrom German Patent No. 29 05 713 C2. The known apparatus includes fixedyarn guiding devices which ensure a straight movement of the yarn. Theyarn passes a feeding apparatus, a first stationary head yarn guide,other prearranged units, a second stationary yarn guide, a traversingapparatus and, finally, a winding spindle on which the yarn is beingwound up. A force transmitting device and a yarn excursion device isassociated with the two fixed guiding devices. The force transmittingdevice includes a contact surface for the yarn which gets in frictionalcontact with the yarn to deflect an arm in response to the yarnexcursion device. The tension of the yarn at maximum excursion and inthe zero crossing of the traversing apparatus is measured by anextensometer strip device. The known unit for determining the tension inthe bobbin material includes at least two stationary guiding devices.The bobbin material is subjected to substantial friction several timeswhich has negative effects in case of sensitive bobbin material beingused.

SUMMARY OF THE INVENTION

[0007] The present invention relates to a winding machine for winding upbobbin material arriving from a feeding apparatus. The winding machineincludes a winding spindle being designed and arranged to be rotated bya drive. A unit serves to determine a signal which is approximatelyproportional to the tension of the bobbin material. The unit includes anarm being designed and arranged to be movable to a limited extent andonly one roller being arranged at the arm. The only one roller isdesigned and arranged to guide the bobbin material to contact thefeeding apparatus and the roller without contacting other elements inbetween.

[0008] The present invention also relates to a winding machine forwinding up bobbin material arriving from a plurality of feedingapparatuses. The winding machine includes a plurality of windingspindles each being designed and arranged to be rotated by a drive. Aplurality of traversing apparatuses each are designed and arranged tocooperate with one of the winding spindles to wind up the bobbinmaterial. A plurality of units each serves to determine a signal whichis approximately proportional to the tension of the bobbin material.Each of the units includes an arm being designed and arranged to bemovable to a limited extent and only one roller being arranged at thearm. The only one roller is designed and arranged to guide the bobbinmaterial to contact the respective feeding apparatus and the respectiveroller without contacting other elements in between.

[0009] With the novel winding machine, it is possible to control asignal which is approximately proportional to the tension in the bobbinmaterial to control the drive of the winding machine in a way to treatthe bobbin material very carefully.

[0010] The novel winding machine or winding apparatus includes only oneroller instead of three deflection rollers as known in the prior art.With this one single roller, the tension in the bobbin material isdetermined by the movement of the roller. In this way, a signal isproduced which has an influence on the engine of the drive driving thewinding spindle by the control unit. This one single roller is supportedon a movable arm or a bar. Especially, the arm is supported to bepivotable or bendable. The movement of the arm is limited to a smallrange which is substantially less than the one during the movement of adancer arm as know in the prior art. The one single roller will still besurrounded by the bobbin material. However, it is possible to increasethe bending radius by increasing the diameter of the one single rollerto bend the bobbin material even more gentle and only in one directionat the roller. The two stationary deflection rollers known in the priorart are not needed in the novel winding machine. Their functions arefulfilled by different elements. The one single roller is arrangedadjacent to the end of the feeding apparatus and the traversingapparatus. This means that no further deflection rollers are locatedbetween these two aforementioned elements. In the prior art, the tensionin the bobbin material is produced between the two deflection rollers.In the novel winding machine, the tension in the bobbin material isproduced between the one single roller and the winding spindle. Thetension in the bobbin material is no longer produced by a dancer arm,but by the drive of the winding spindle. The engine or the motor of thedrive of the winding spindle does not only compensate changes concerningthe tension in the bobbin material, but it determines the tension in thebobbin material. The bobbin material moves on from the one single rollerdirectly into the traversing apparatus. In this way, the traversingtriangle is advantageously increased. The unit or the device fordetermining a signal which is approximately proportional to the tensionin the bobbin material only needs to include a comparatively smallnumber of components, it is compact and it may be produced at low costs.Without having to use additional mechanical components, as for exampledeflection rollers, it is possible to produce different characteristicsof tension curves during a winding travel. The reason for this effect isthe fact that the tension of the yarn or of a different bobbin materialis only produced by the motor of the drive of the winding spindle. Forexample, reducing, increasing or constant tension values may be used inthe form of software tables. These values may be easily and reproduciblyused. Due to the fact that the bobbin material only surrounds one singleroller, the bending load subjecting the bobbin material and frictionforces are substantially reduced. The movement of the one single rollerbeing arranged at the free end of the arm preferably has a value of lessthan approximately 1 mm. Preferably, the value may only be approximatelya few {fraction (1/10)} mm. Consequently, the surrounding angle of thebobbin material at the one single roller does not substantially change,and the geometry of the arriving bobbin material remains substantiallyconstant during the entire winding travel.

[0011] The arm may include a bending bar and the unit may include atleast one sensor for sensing deflection of the bending bar. There alsois the possibility of directly designing the arm as a bending bar in away that the arm is only supported at one side and the bending forcesare applied by the bobbin material moving over the one single roller.However, it is also possible that the arm only functions as a lever armand that it is operatively connected to a bending bar which is bent bythe lever arm. In this way, it is possible to intentionally enlarge thelever arm in case of respective structural conditions. The bending barincludes a sensor for sensing the deflection. The sensor may be directlyarranged on the bending bar, or it may be operatively connected to thebending bar. For example, the sensor may include extensometer strips.However, force sensors, way sensors and the like may also be used. Therespective sensor may include an electronic unit with which thedeflection is transformed to an electric signal, especially to anelectric potential. The combination of the sensor and the electronicunit for evaluation purposes allows for a small, compact design.

[0012] The arm may also be designed and arranged as a scale beam, andthe unit may include at least one sensor for sensing the force of thebobbin material which subjects the one roller. The scale beam may alsobe designed as a control lever. It has a substantially stiff design, andit is supported approximately in its middle portion or outside itsmiddle portion to transmit the force being applied onto the one singleroller by the bobbin material to the sensor. The sensor may includeextensometer strips, force sensors or the like.

[0013] However, the preferred embodiment of the arm is the one with abending bar including extensometer strips. It is possible withoutproblems to fix the bending bar at its one end at the supportingstructure of the winding machine, to arrange the extensometer stripsapproximately in the middle portion of the arm and to arrange the oneroller at the free end of the arm. It makes sense to arrange theextensometer strips on the bending bar in association with the bendingplane of the bending bar.

[0014] The bending bar may have a nominal bending portion, and theextensometer strips may be arranged in the nominal bending portion. Sucha nominal or desired bending portion may be designed as a weakenedportion of the bending bar to improve elastic bending deformation at theplace where the extensometer strips are arranged. Usually, the bendingbar has a cylindrical design. In this case, the nominal bending portionmay include flattened, plain surfaces on which the extensometer stripsmay be easily and effectively placed.

[0015] The unit may further include a tubular housing including aplurality of adjustable stops, and the bending bar may be arranged inthe tubular housing. The stops may be designed and arranged to limitdeflection or movement of the bending bar in the tubular housing. Forexample, the adjustable stops may be designed as adjustable screws. Thetubular housing also serves to protect the bending bar, the sensors andthe electronic unit.

[0016] In case the winding machine includes a plurality of winding headseach including a winding spindle and a traversing apparatus, the unitseach including one single roller and together being arranged at aseparate machine unit may be arranged at a comparatively great distancewith respect to the traversing apparatus of each winding head such thatthe traversing triangle gets especially long and the variationsconcerning tension in the bobbin material resulting from the windingprocess are reduced.

[0017] Other features and advantages of the present invention willbecome apparent to one with skill in the art upon examination of thefollowing drawings and the detailed description. It is intended that allsuch additional features and advantages be included herein within thescope of the present invention, as defined by the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The invention can be better understood with reference to thefollowing drawings. The components in the drawings are not necessarilyto scale, emphasis instead being placed upon clearly illustrating theprinciples of the present invention. In the drawings, like referencenumerals designate corresponding parts throughout the several views.

[0019]FIG. 1 is a schematic side view of the novel winding machine.

[0020]FIG. 2 is a sectional view through the sensor according to lineII-II of FIG. 1.

[0021]FIG. 3 is a similar view as FIG. 1, but it illustrates a novelwinding machine including five winding spindles.

[0022]FIG. 4 is a similar view as FIG. 2, but it illustrates a sensorincluding a scale beam.

DETAILED DESCRIPTION

[0023] Referring now in greater detail to the drawings, FIG. 1illustrates a novel winding machine 1 including a supporting structure 2carrying a front plate 3. A winding spindle 4 is rotatably supported inthe front plate 3. The winding spindle 4 extends through the front plate2, and it freely ends towards the outside. The winding spindle 4 isdriven by a drive including an engine. The drive is not illustrated tosimplify understanding of the drawing. The drive may a conventional oneas it is used in the field of winding machines. The winding spindle 4 issupported by a bearing 5 to be pivotable to a certain limited extend. Anelongated hole 6 is located in the front plate 3 to allow for thepivotal movement. A bobbin 7 is put on the winding spindle 4. During thewinding process, the bobbin material 8 is wound up on the bobbin 7. Forexample, the bobbin material 8 may be yarn or tape. The continuous linesillustrate the beginning of the winding process, meaning the beginningof the winding travel of the material with respect to the bobbin 7 andto the spindle 4, respectively. The position of the winding spindle 4including the wound up bobbin material 8 at the end of the windingtravel is illustrated by the broken line with two dots.

[0024] A rotatable contact roller 9 is supported in a region of thefront plate 3 in association with the winding spindle 4. The rotatablecontact roller 9 is stationary. At the beginning of the winding travel,the bobbin 7 being detachably located on the winding spindle 4 contactsthe circumference of the contact roller 9. During the winding travel,the surface of the wound up material of the bobbin material 8 contactsthe contact roller 9. A traversing apparatus 10 is associated with thecontact roller 9 and with the winding spindle 4. With the traversingapparatus 10, the bobbin material 8 is placed on the circumference ofthe bobbin 7 and on the already wound up bobbin material 8,respectively, over the length of the bobbin 7. The function of thetraversing apparatus 10 is well known by a person with skill in the art.

[0025] The bobbin material 8 is fed to the winding machine 1 by afeeding apparatus 11. In the illustrated exemplary embodiment, thefeeding apparatus 11 is not a component of the winding machine 1.Instead, it is located at the end of a producing unit for the bobbinmaterial 8 with which the bobbin material 8 is continuously fed to thewinding machine 1. However, it is also possible to arrange the feedingapparatus 11 in the region of the winding machine 1. In the illustratedexemplary embodiment, the feeding apparatus 11 includes two rollerswhich guide the bobbin material 8 and with which the bobbin material 8is guided without having to change its direction of movement.

[0026] A unit 14 for determining a signal which is proportional to thetension of the bobbin material 8 is arranged at a separate machine unit13 being supported on the supporting structure 2. The tension of thebobbin material or the tension prevailing in the bobbin material is tobe understood as the tension resulting from pulling forces subjectingthe material. The unit 14 serves to control the drive of the windingspindle 4. The unit 14 includes an arm 15 having the design of acylinder-like axle. The arm 15 at its one end facing the machine unit 13is fixedly connected, and at its freely protruding end, it carries aroller 16 over which the bobbin material 8 is guided. The arm 15 mayalso be called a cantilever arm. The roller 16 is the only roller andthe only place at which the moving direction of the bobbin material 8changes between the feeding apparatus 11 and the traversing apparatus10. The arm 15 with the roller 16 is arranged with respect to thefeeding apparatus 11 and the traversing apparatus 10 such that thebobbin material 8 surrounds the roller 16 at a respective surroundingangle. The roller 16 at the arm 15 is supported to be freely rotatableto sensitively change the direction of movement of the bobbin material8. The bobbin material 8 is subjected to a bending load. However,compared to usual dancer arm arrangements known in the art, there onlyis a bending effect towards one side, but not an alternate bendingeffect. Additionally, the diameter of the roller 16 may be chosen to becomparatively great to further reduce the bending load. During thewinding travel, meaning the movement of the bobbin material 8 over thelength of the bobbin 7, the bobbin material 8 deflects the arm 15 withthe roller 16 being located thereon in the direction of arrow 17. Thedirection of the arrow 17 is the bisecting between the bobbin material 8arriving at the roller 16 and leaving the roller 16.

[0027] The novel unit 14 with the roller 16 replaces dancer armarrangements known in the prior art which include two stationarydeflecting rollers and one movable roller being located on the dancerarm. It is to be seen from FIG. 1 that the novel winding apparatus 1does not include the two deflecting rollers as known from the prior art,and that the bobbin material 8 stays free from alternate bending forces.The arrangement of the novel unit 14 on a separate machine unit 13allows for the possibility of choosing the distance between thetraversing apparatus 10 and the unit 14 desirably great to attain agreat traversing triangle. However, it is also possible to arrange theunit 14 in a different region of the supporting structure 2.

[0028] It is to be seen from FIG. 1 that the unit 14 for determining asignal which is approximately proportional to the tension in the bobbinmaterial 8 to control the drive of the winding spindle 4 works differentthan known prior art devices. During use of a known dancer arm, thetension in the bobbin material 8 is produced by the dancer arm beingsubjected by springs, weights or the like, and the engine of the driveof the winding spindle only compensates variations of the tension. Inthe novel winding machine 1, the application of the tension in thebobbin material is exclusively produced by the engine of the drive ofthe winding spindle 4. The only roller 16 of the novel winding machine 1also fulfils the functions of the two deflection rollers of prior artdevices. In prior art winding machines, the tension in the bobbinmaterial is produced between the two deflection rollers. In the novelwinding machine 1, the tension in the bobbin material 8 is producedbetween the winding spindle 4 and the roller 16. In prior art windingmachines, the traversing triangle is located between the last deflectionroller being located upstream of the traversing apparatus and the dancerarm arrangement and the traversing apparatus. In the novel windingmachine 1, the traversing triangle is located between the only oneroller 16 and the traversing apparatus 10.

[0029]FIG. 2 illustrates a section according to line II-II in FIG. 1taking into account the direction of the arrow 17. FIG. 2 shows thenovel unit 14 in greater detail. The unit 14 includes the cylinder-likearm 15 in the form of a cantilever. In the illustrated exemplaryembodiment, the arm 15 has the form of a bending bar 18. The bending baror beam 18 at its one end 19 is supported in a tubular housing 20. Thetubular housing 20 is supported at the machine unit 13. In this way, theone end 20 of the bending bar 18 is fixedly supported in a way that theother end 21 of the bending bar 18 freely protrudes or cantilevers. Theroller 16 in the region of this end 21 is supported to be freelyrotatable. The bending bar 18 in its middle portion includes a desiredbending portion 22. The desired or nominal bending portion 22 is formedby flattened portions and by tapered portions of the bending bar 18. Atthis place, the bending bar 18 includes a plate-like portion 23 havingplane surfaces on which, for example, extensometer strips 24 arelocated. The extensometer strips 24 form part of a sensor 25 fordetermining the deflection of the bending bar 18 in response to thetension in the bobbin material 8. An electronic unit 26 is located inthe region of the end 19 of the bending bar 18, or at least inside thetubular housing 20. The electric signal corresponding to the deflectionof the bending bar 18 is sent to the control unit (not shown) for thedrive of the winding spindle 4 by the electronic unit 26 and a cable 27.

[0030] The tubular housing 20 includes adjustable stops 28 to limit themaximum deflection of the bending bar 18 in the direction of the arrow17. The adjustable stops 28 may be designed as adjustment screws.Furthermore, a seal 29 is located in the front end portion of thetubular housing 20. The seal 29 prevents dust and impurities fromentering the interior of the tubular housing 20.

[0031]FIG. 3 illustrates another exemplary embodiment of the novelwinding machine 1 including five winding heads 30 being located on thesupporting structure 2. Each winding head 30 has the design as describedwith respect to FIG. 1. In the illustrated exemplary embodiment, thereis a separate machine unit 13 on which the units 14 each beingassociated with a winding head 30 are located. The respective traversingtriangles have different sizes. However, this does not have a negativeeffect since even the smallest traversing triangle has a substantiallength such that changes concerning tension in the bobbin material 8 dueto the winding process are neglectable. These changes concerning tensionare so small that they are dampened by the control unit for the drive ofthe winding spindle 4 not reacting responsive to these changes.

[0032]FIG. 4 illustrates another exemplary embodiment of the novel unitor device 14. The illustration of FIG. 4 is similar to the one of FIG.2. In the illustrated embodiment, the arm 15 is designed as a scalebeing 31. The scale being or balance arm 31 is a stiff component whichis pivotal to a limited extent. For example, it may be pivotal about thebearing 32 being located in its middle portion. In the illustratedembodiment, the respective sensor 25 is designed as a force sensor 33,and it is located inside the machine unit 13. The force sensor 33determines the force of the scale being 31 being applied onto the roller16 by the bobbin material 8 during the winding travel. The force isdetermined at the place where the force sensor 33 is located.

[0033] Many variations and modifications may be made to the preferredembodiments of the invention without departing substantially from thespirit and principles of the invention. All such modifications andvariations are intended to be included herein within the scope of thepresent invention, as defined by the following claims.

I claim:
 1. A winding machine for winding up bobbin material arrivingfrom a feeding apparatus, comprising: a winding spindle being designedand arranged to be rotated by a drive; and a unit for determining asignal which is approximately proportional to the tension of the bobbinmaterial, said unit including an arm being designed and arranged to bemovable to a limited extent and only one roller being arranged at saidarm, said only one roller being designed and arranged to guide thebobbin material to contact the feeding apparatus and said roller withoutcontacting other elements in between.
 2. The winding machine of claim 1,wherein said arm includes a bending bar and said unit includes at leastone sensor for sensing deflection of said bending bar.
 3. The windingmachine of claim 1, wherein said arm is designed as a bending bar andsaid unit includes at least one sensor for sensing deflection of saidbending bar.
 4. The winding machine of claim 1, wherein said arm isdesigned and arranged as a scale beam and said unit includes at leastone sensor for sensing the force of the bobbin material which subjectssaid one roller.
 5. The winding machine of claim 2, wherein said bendingbar includes a plurality of extensometer strips.
 6. The winding machineof claim 3, wherein said bending bar includes a plurality ofextensometer strips.
 7. The winding machine of claim 5, wherein saidbending bar has a nominal bending portion and said extensometer stripsare arranged in said nominal bending portion.
 8. The winding machine ofclaim 6, wherein said bending bar has a nominal bending portion and saidextensometer strips are arranged in said nominal bending portion.
 9. Thewinding machine of claim 5, wherein said unit further includes a tubularhousing including a plurality of adjustable stops and said bending baris arranged in said tubular housing, said stops being designed andarranged to limit deflection of said bending bar in said tubularhousing.
 10. The winding machine of claim 6, wherein said unit furtherincludes a tubular housing including a plurality of adjustable stops andsaid bending bar is arranged in said tubular housing, said stops beingdesigned and arranged to limit deflection of said bending bar in saidtubular housing.
 11. The winding machine of claim 7, wherein said unitfurther includes a tubular housing including a plurality of adjustablestops and said bending bar is arranged in said tubular housing, saidstops being designed and arranged to limit deflection of said bendingbar in said tubular housing.
 12. The winding machine of claim 8, whereinsaid unit further includes a tubular housing including a plurality ofadjustable stops and said bending bar is arranged in said tubularhousing, said stops being designed and arranged to limit deflection ofsaid bending bar in said tubular housing.
 13. The winding machine ofclaim 1, further comprising a traversing apparatus.
 14. The windingmachine of claim 1, wherein said bobbin material is sensitive.
 15. Awinding machine for winding up bobbin material arriving from a feedingapparatus, comprising: a winding spindle being designed and arranged tobe rotated by a drive; and a unit for determining a signal which isapproximately proportional to the tension of the bobbin material, saidunit including: a bending bar being designed and arranged to be movableto a limited extent, one single roller being arranged at said bendingbar, said one single roller being designed and arranged to guide thebobbin material in a way to contact the feeding apparatus and saidroller without contacting other elements in between, and at least onesensor for sensing deflection of said bending bar, said sensor includinga plurality of extensometer strips.
 16. The winding machine of claim 15,wherein said bending bar has a nominal bending portion and saidextensometer strips are arranged in said nominal bending portion. 17.The winding machine of claim 15, wherein said unit further includes atubular housing including a plurality of adjustable stops and saidbending bar is arranged in said tubular housing, said stops beingdesigned and arranged to limit deflection of said bending bar in saidtubular housing.
 18. The winding machine of claim 16, wherein said unitfurther includes a tubular housing including a plurality of adjustablestops and said bending bar is arranged in said tubular housing, saidstops being designed and arranged to limit deflection of said bendingbar in said tubular housing.
 19. The winding machine of claim 15,wherein said bobbin material is sensitive.
 20. A winding machine forwinding up bobbin material arriving from a plurality of feedingapparatuses, comprising: a plurality of winding spindles each beingdesigned and arranged to be rotated by a drive; a plurality oftraversing apparatuses each being designed and arranged to cooperatewith one of said winding spindles to wind up the bobbin material; and aplurality of units each for determining a signal which is approximatelyproportional to the tension of the bobbin material, each of said unitsincluding an arm being designed and arranged to be movable to a limitedextent and only one roller being arranged at said arm, said only oneroller being designed and arranged to guide the bobbin material tocontact the respective feeding apparatus and said respective rollerwithout contacting other elements in between.
 21. The winding machine ofclaim 20, wherein said plurality of units are arranged in a separatemachine unit.
 22. The winding machine of claim 20, wherein each of saidarms includes a bending bar and each of said units includes at least onesensor for sensing deflection of said bending bar.
 23. The windingmachine of claim 1, wherein each of said arms is designed as a bendingbar and each of said units includes at least one sensor for sensingdeflection of said bending bar.
 24. The winding machine of claim 20,wherein each of said arms is designed and arranged as a scale beam andeach of said units includes at least one sensor for sensing the force ofthe bobbin material which subjects said one roller.
 25. The windingmachine of claim 22, wherein each of said bending bars includes aplurality of extensometer strips.
 26. The winding machine of claim 23,wherein each of said bending bars includes a plurality of extensometerstrips.
 27. The winding machine of claim 22, wherein each of said unitsfurther includes a tubular housing including a plurality of adjustablestops and said bending bar is arranged in said tubular housing, saidstops being designed and arranged to limit deflection of said bendingbar in said tubular housing.
 28. A winding machine for winding up bobbinmaterial arriving from a plurality of feeding apparatuses, comprising: aplurality of winding spindles each being designed and arranged to berotated by a drive; a plurality of traversing apparatuses each beingdesigned and arranged to cooperate with one of said winding spindles towind up the bobbin material; and a plurality of units each fordetermining a signal which is approximately proportional to the tensionof the bobbin material, each of said units including: a bending barbeing designed and arranged to be movable to a limited extent, onesingle roller being arranged at said bending bar, said one single rollerbeing designed and arranged to guide the bobbin material in a way tocontact the feeding apparatus and said roller without contacting otherelements in between, and at least one sensor including a plurality ofextensometer strips for sensing deflection of said bending bar.
 29. Thewinding machine of claim 28, wherein each of said units further includesa tubular housing including a plurality of adjustable stops and saidbending bar is arranged in said tubular housing, said stops beingdesigned and arranged to limit deflection of said bending bar in saidtubular housing.
 30. The winding machine of claim 28, wherein saidplurality of units are arranged in a separate machine unit.